

\(\epsilon _m\)  being the dielectric constant of the medium and \(\alpha \)  the polarizability of the sphere which is proportional to the cube of its radius [1]}, [2]}.
This homodimer configuration was used as an initial value in the time consuming iterative process of finding a heterodimer configuration compatible with the experimental data using GMMie calculation.
The traveling wave approximation of the evanescent field was used as the particles are small compared to the decay length of the field [3]}, [4]} and the collection efficiency is much smaller for the dipole induced in the optical axis orientation than for the one perpendicular to it.
